Abstract
The aerodynamic and the noise characteristics of a centrifugal fan were obtained experimentally. Typical velocity components-for example absolute velocity and relative velocity-were caluculated from the characteristics of aerodynamics and the theory of fans. Changes in the typical velocity components with changes in the flow coefficient were converted to the change in the noise level by using 6th dependency of the power to the velocity and compared with the characteristics of noise. The results showed that the noise and the aerodynamic characteristics were closely correlated and showed that the principal velocity determining the noise level was relative velocity. A model for predicting the noise level of a centrifugal fan was described and its predictions were in good agreement with the measured levels.
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